Go Bottom4300 runs slow in forward OK in reverse
 | angmach
Join Date: Nov 2009 Posts: 7 La Monte, MO 
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2010-10-30 174860
My 4300 Sync Reverse tractor runs at varying speeds going forward, with or with-out a load. I can be dragging a box-blade of dirt and my speed goes anywhere from normal speed to barely moving and back again with no real change in engine speed. Engine does not bog down. Everything is normal in reverse.
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| hardwood
Join Date: Dec 2002 Posts: 3583 iowa 
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2010-10-30 174867
A 12/12 reveser has a traction clutch for both forward and reverse depending on which way you dash mounted lever is positioned. There is a sepearate electric controled hydraulic valve for each direction to push pressure to the clutch you need for either direction and relax the pressure for the other direction. Being you have a similar erratic speed whether loaded or empty would make me think that something is keeping the forward valve from letting enough pressure, 1200 lb. I think, to the clutch rather than a clutch problem with normal pressure would say perhaps a broken clutch plate.
First thing I'd check is the electrical connectiions under the tractor that hook to the valves that may be giving you not quite enough voltage to hold the forward valve completely open.
My service manual goes on into having a clooged hyd filter that can be the problem too, but being reverse works, I'd doubt the filter being the problem.
Hope this helps.
Frank. ....
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